Memorial service

AP photo by Bob Edme

French President Nicolas Sarkozy (center) his wife Carla Bruni-Sarkozy (left) and French Prime Minister Francois Fillon (right) arrive at the Notre-Dame cathedral for an ecumenical church service for relatives and families of the passengers of Air France's flight 447 that vanished Monday over the Atlantic ocean on Wednesday in Paris, France. The reason for the crash remains unclear -- fierce thunderstorms, lightning or a catastrophic combination of causes are being listed as possible theories.

French President Nicolas Sarkozy (center) his wife Carla Bruni-Sarkozy (left) and French Prime Minister Francois Fillon (right) arrive at the Notre-Dame cathedral for an ecumenical church service for relatives and families of the passengers of Air France's flight 447 that vanished Monday over the Atlantic ocean on Wednesday in Paris, France. The reason for the crash remains unclear -- fierce thunderstorms, lightning or a catastrophic combination of causes are being listed as possible theories. (AP photo by Bob Edme)

French President Nicolas Sarkozy (center) his wife Carla Bruni-Sarkozy (left) and French Prime Minister Francois Fillon (right) arrive at the Notre-Dame cathedral for an ecumenical church service for relatives and families of the passengers of Air France's flight 447 that vanished Monday over the Atlantic ocean on Wednesday in Paris, France. The reason for the crash remains unclear -- fierce thunderstorms, lightning or a catastrophic combination of causes are being listed as possible theories.